EVB-USB5744

EVALUATION BOARD

USER’S GUIDE

 2014 Microchip Technology Inc.

DS50002306A-page 12

Chapter 2. Getting Started

The Microchip EVB-USB5744 is designed for flexible configuration solutions. It can be

configured via default internal register settings, downloadable external firmware to an

onboard SPI Flash, through SMBus, or through the onboard configuration switches.

When configured with the default internal register settings, the device operates as a

USB 3.0/2.0 hub with four battery charge enabled USB ports and Microchip’s standard

VID/PID/DID settings.

2.1

CONFIGURATION

2.1.1

External SPI Flash

Upon power-up, the USB5744 first looks for an external SPI Flash device and a valid

signature in the flash. If one is found, the external ROM is enabled and code execution

is initiated from the external SPI device.

To select the SPI device, set the Config. Select switch to "SPI", position 1-2. The blue

LED will light. Note that the CFG_BC and CFG_Non-Rem options are now de-selected.

All configuration in SPI mode is done by the SPI.

FIGURE 2-1:

SPI SELECT

The 10 k

(HOLDn) pins must also be populated in order to use external flash. The 10 k

(R61) on the SPI_CE_N pin of the USB5744 must also be populated in order to select 60MHz

SPI operation, as opposed to 30MHz operation. Additionally there must be a jumper placed on

Note: If the SPI Flash is not properly programmed or has an invalid signature, the

USB5744 will default to internal defaults even if the SPI Flash is selected.